# How to define the Reynolds Number in CFX?

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 November 6, 2013, 06:53 #21 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,709 Rep Power: 98 The streamlines are the velocity field. If you ignore that - then why bother doing CFD?

April 27, 2014, 03:32
#22
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sepideh
Join Date: Jul 2011
Posts: 21
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Quote:
 Originally Posted by ghorrocks I do not understand your question. Are you having problems calculating the particle Re number? Are problems implementing you drag law?
Hi There,

Yeah I want to define Re Number as an expression in CFX-pre, and then drag coefficient. In that way I can define a new drag model than a common Schiller-Naumann correlation. Thank's a lot.

Regards,
Sep

 April 27, 2014, 06:27 #23 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,709 Rep Power: 98 Have you done the tutorials? They show you have to implement CEL expressions.

September 3, 2015, 22:09
How to check material properties valve in CFX.
#24
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N B Khan
Join Date: Jan 2014
Posts: 37
Rep Power: 4
How to check material properties valve in CFX. It just show the material like air, water.etc...no material propoerties here... Plz help me how to change the material properties...
I am new here and new in CFX.

Quote:
 Originally Posted by Loris88 Hi ghorrocks! Since you have said me to read this post, I will write here my question. I have read the questions and the relative answers but I did not find the solution for my problem. I have a 2D problem. I created the mesh with ICEM and then I extruded it with the shrewdness of to put as depth, 1 cell like thikness. After importing the mesh in CFX, I have put boundary condition of symmetry for to simulate the 2D problem. I have these measures of the rectangular channel: -Length: 3900 mm -Heigth: 50 mm (Characteristic length L) -Depth: 1 cell like thikness -Re= 80000 (known input of the problem) -Velocity along x axis= 24 m/s (u) at the inlet. The other velocities are 0 m/s. No swirl component. -Dynamic viscosity: 1.8058e-05 kg/m*s (alpha) -Density: 1.20438 kg/m^3 (beta) -Kinematic viscosity: alpha/beta= 1.4993e-5 (ni) Re= (u*L)/ni ~ 80000 [for precision 80034] But Ansys has given me Re=9.2723E+04 How can I do for to solve this problem? Thanks

 September 4, 2015, 01:58 #25 Senior Member   Lance Join Date: Mar 2009 Posts: 598 Rep Power: 12 In CFX-pre in the tree to the left you have stuff like Simulation, Analysis Type, Solver, Coordinate Frames, and a thing called Materials. Right click, insert/material. Or from the menu in the top, click insert/material. This is the easy part with CFD, and if you have problems with this you should at least do all the tutorials before doing anything else.

September 7, 2015, 00:59
#26
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N B Khan
Join Date: Jan 2014
Posts: 37
Rep Power: 4
Thanks dear... This forum is really great for the beginner... it help me alot....

Quote:
 Originally Posted by Lance In CFX-pre in the tree to the left you have stuff like Simulation, Analysis Type, Solver, Coordinate Frames, and a thing called Materials. Right click, insert/material. Or from the menu in the top, click insert/material. This is the easy part with CFD, and if you have problems with this you should at least do all the tutorials before doing anything else.

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